memory-investigation

This code presents memory issues.

Use Launcher.java with -Xms100m and -Xmx100m JVM parameters. Execute generateTrades() method of trade.calculator.ConsoleMBean. See what happens.

Tools could help you to understand the observed memory behaviors:

• JDK commands
  • jps https://docs.oracle.com/javase/8/docs/technotes/tools/unix/jps.html
  • jstat https://docs.oracle.com/javase/8/docs/technotes/tools/unix/jstat.html
  • jmap https://docs.oracle.com/javase/8/docs/technotes/tools/unix/jmap.html
  • jcmd https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/tooldescr006.html
• GC logs: -XX:+PrintGCDetails -XX:+PrintGCDateStamps -Xloggc:gc.log
• GCViewer (https://github.com/chewiebug/GCViewer)
• -XX:+HeapDumpOnOutOfMemoryError
• Memory Analyzer Tool (http://www.eclipse.org/mat/)
• Java Mission Control (add -XX:+UnlockCommercialFeatures and -XX:+FlightRecorder JVM arguments)
• https://github.com/jmaloney10/allocation-instrumenter
• ...

Good luck !